package com.npr.entity;

/**
 * 封装分页相关的信息
 */
public class Page {
    //当前页码
    private int current = 1;
    //显示上限
    private int limit = 10;
    //数据总数(用于计算总的页数)
    private int rows;
    //查询路径(用于复用分页连接)
    private String path;

    public int getCurrent() {
            return current;
    }

    public void setCurrent(int current) {
        if(current>=1) {
            this.current = current;
        }
    }


    public int getLimit() {
            return limit;
    }

    public void setLimit(int limit) {
        if(limit>=1&&limit<=100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     */
    public int getOffset(){
        //current*limit-limit
        return (current-1)*limit;
    }

    /**
     * 获取总页数
     * @return
     */
    public int getTotal(){
        //rows/limit[+1]
        if((rows%limit)==0){
            return rows/limit;
        }else{
            return rows/limit +1;
        }
    }

    /**
     * 获取起始页码
     * @return
     */
    public int getFrom(){
        int from = current - 2;
        return from< 1?1:from;
    }

    /**
     * 获取结束页码
     * @return
     */
    public int getTo(){
        int to = current + 2;
        int total = getTotal();
        return to>total?total:to;
    }
}
